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S.97

S.97 - Water pressure sensor test running

Vaillant · ecoTEC plus Boilers

What does S.97 mean?

The boiler is currently performing a self-test of the water pressure sensor. During this diagnostic test, heating demands are temporarily blocked.

Common Causes

  • The boiler's internal diagnostic system is performing a routine check of the water pressure sensor.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    No user action is required, as this is a normal self-test function of the boiler.

  2. 2

    Wait for the test to complete; heating demands will resume automatically once the diagnostic is finished.

  3. 3

    If this status persists for an unusually long period, contact customer service for further assistance.

Browse all codes in this manual (146)
Verified technical data. Last updated: April 2026

Related Faults

Communication fault (display/PCB)Communication fault - No communication with the PCBD.092 = 1D.092 = 1 — actoSTOR module connection errorF.0F.0 — Flow–NTC open circuit
Source: Vaillant ecoTEC plus Boilers
Open Manual (Page 46)Search more codes in this manual